Portable platform



FIG. 1 is a front elevational view of a portable platform showing my newdesign;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side view, taken from the left side of FIG. 1;

FIG. 4 is a side view, taken from the right side of FIG. 1;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof.

The ornamental design for a portable platform, as shown and described.